The Muscular Syste2

The Muscular Syste2 - muscles by associated connective...

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The Muscular System Functions of the Muscular System The skeletal system functions to constrict organs and vessels, pump blood, cause respiration, produce body movement, maintain posture, produce movements involved in communication, and produce body heat. Characteristics of Skeletal Muscle Skeletal muscle has contractility, excitability, extensibility, and elasticity. Structure Each skeletal muscle fiber is a single cell containing numerous myofibrils. Myofibrils are composed of actin and myosin myofilaments. Sarcomeres are joined end to end to form myofibrils. Muscle fibers are organized into fasciculi, and fasciculi are organized into
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Unformatted text preview: muscles by associated connective tissue. Membrane Potentials • Cell membranes have a relative positive charge on the outside and a relative negative charge inside. • Action potentials are a brief reversal of the membrane charge. Nerve Supply • Motor neurons carry action potentials to skeletal muscles, where the neuron and muscle fibers form neuromuscular junctions. • Neurons release acetylcholine, which binds to receptors on muscle cell membranes, stimulates an action potential in the muscle cell, and causes the muscle to contract. ....
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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